Peganum harmala-L Seeds adsorbent for the rapid removal of noxious brilliant green dyes from aqueous phase

Biogenic Peganum harmala-L Seeds treated with microwave were used to synthesize the novel adsorbent i.e. Peganum harmala activated carbon (PHAC), for the rapid removal and fast adsorption of BG from the solvent phase. Surface characterization techniques such as FE-SEM and FUR were used for morphological and topological analysis of the synthesized novel adsorbent. Parameters such as contact time, initial dye concentration, temperature, adsorbent dose and initial pH of the solution were well investigated and optimized using batch adsorption method. It is observed that the percentage removal of BG and the uptake of BG increased from 88.86% to 93.25% and from 17.77 to 18.65 mg/g with the increase in the temperature from 298 to 333 K, respectively, which directly reveals the endothermic nature. The adsorption equilibrium studies clearly revealed a homogeneous adsorption with the maximum adsorption capacity of 35.971 mg/g at 298 K. The adsorption kinetic process follows pseudo-second-order reaction kinetics. (C) 2017 Elsevier B.V. All rights reserved.